US5298865A - Connecting circuit for connecting a lambda probe to a control apparatus of an internal combustion engine and test method for said circuit - Google Patents

Connecting circuit for connecting a lambda probe to a control apparatus of an internal combustion engine and test method for said circuit Download PDF

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Publication number
US5298865A
US5298865A US07/872,810 US87281092A US5298865A US 5298865 A US5298865 A US 5298865A US 87281092 A US87281092 A US 87281092A US 5298865 A US5298865 A US 5298865A
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United States
Prior art keywords
ground
probe
lambda probe
line
signal
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Expired - Lifetime
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US07/872,810
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English (en)
Inventor
Helmut Denz
Werner Mezger
Johannes-Dieter Wichterich
Ernst Wild
Joachim Heimes
Eugen Joos
Lothar Raff
Eberhard Schnaibel
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Robert Bosch GmbH
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Robert Bosch GmbH
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Assigned to ROBERT BOSCH GMBH, A CORP. OF FED. REP. OF GERMANY reassignment ROBERT BOSCH GMBH, A CORP. OF FED. REP. OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RAFF, LOTHAR, SCHNAIBEL, EBERHARD, HEIMES, JOACHIM, JOOS, EUGEN, DENZ, HELMUT, WICHTERICH, JOHANNES-DIETER, WILD, ERNST, MEZGER, WERNER
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1493—Details
    • F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/4065—Circuit arrangements specially adapted therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
    • G01N27/4175—Calibrating or checking the analyser

Definitions

  • the invention relates to a connecting circuit for a potential-free lambda probe having a ground line and a signal line as well as a test method for checking for faults when connecting the lambda probe such as short circuits or interruptions in the ground line or signal line.
  • Lambda probes of the Nernst type have been known since the start of catalyzer technology with lambda control in motor vehicles and will be used most often also in the next few years. These lambda probes have a very steep characteristic; that is, the probe voltage changes only slightly with increasing rich mixture in the case of the measurement of a rich mixture and changes only slightly with lean mixtures with increasing lean mixture. However, in contrast, in the transition from a rich to a lean mixture within a very tight mixture range, a change of several 100 mV occurs. Typically, the probe voltage is at approximately 850 mV when measuring a rich mixture and at approximately 100 mV when measuring a lean mixture. The actual measured voltages fluctuate considerably however from one probe to another. A first probe can display 1 V when measuring a rich mixture and another probe can measure up to approximately -80 mV when measuring a lean mixture.
  • the conventional practice is that when the probe voltage has a value of 0 V over a longer time span, the fuel/air mixture is arbitrarily enriched. If the probe signal does not respond to this enrichment, this is a reliable indication that a ground short is present. It is disadvantageous in this test method that the mixture must be enriched which leads to an increased exhaust of toxic gas and also causes other disadvantages.
  • Lambda probes are mostly so mounted that they detect the gas composition in the exhaust gas flow forward of a catalyzer.
  • a lambda probe can be mounted rearwardly of the catalyzer and, with the aid of this probe, the conversion capacity of the catalyzer is monitored.
  • a gas mixture of very uniform composition flows past the rearward lambda probe.
  • a voltage of approximately 450 mV is measured notwithstanding the relatively steep characteristic of the probe, since the lambda value rearward of the catalyzer is quite constant at the value one.
  • the connecting circuit according to the invention is for a potential-free lambda probe having a ground line and a signal line.
  • the connecting circuit includes an offset voltage source which is connected to the ground line in order to raise the potential thereof to a pregiven value with respect to ground.
  • the lowest measured potential of the signal line can never have a lower value with respect to ground (when the circuit is operable) than that value which corresponds essentially to the offset voltage.
  • the above-mentioned potential drops significantly below the offset voltage, it is certain that a ground short is present.
  • the above-mentioned fault is noted directly when it occurs without a previous enrichment; that is, not only after a greater time span as with conventional methods.
  • the method according to the invention is for testing the connecting circuit of a potential-free lambda probe having a ground line and a signal line.
  • the method includes the steps of: raising the potential of the ground line by a pregiven offset voltage with respect to ground potential; measuring the signal-line potential of the signal line relative to ground to determine if said signal-line potential is below a threshold value with said threshold value being at most equal to the difference between said offset voltage and the maximum possible amplified negative probe voltage; and, after determining that said signal-line potential is below said threshold value, then emitting a fault signal.
  • interruptions can be determined with the aid of the offset voltage.
  • an interruption can be determined in the conventional manner in that the probe voltage remains continuously at a pregiven value.
  • FIG. 1 is a schematic of a probe connecting circuit having an offset voltage source and a pull-down resistor
  • FIG. 2 is a schematic of a probe connecting circuit having an ancillary voltage source and an offset voltage source;
  • FIG. 3 is a schematic of a connecting circuit for two probes having a common offset voltage source
  • FIG. 4 is a flowchart for explaining a test method for detecting faults of a probe connecting circuit.
  • resistors and voltage sources are often discussed.
  • the designations of these components correspond to the resistance values and voltage values of the respective components.
  • UOS identifies an offset voltage source as a component as well as the voltage of this component.
  • R -- SV is correspondingly the identification for a resistor component which here is the substitute resistor of a lambda probe forward of a catalyzer as well as for the resistance value of this component.
  • FIGS. 1 and 2 are described in detail, an introductory overview of FIG. 3 is provided.
  • FIG. 3 shows a control apparatus SG to which a lambda probe SV mounted forward of a catalyzer (not shown) is connected via a signal line SL -- SV and a ground line ML -- SV and to which a probe SH mounted rearward of the catalyzer is connected via a signal line SL -- SH and a ground line ML -- SH.
  • the two ground lines lead to the same terminal of the control apparatus SG.
  • the above-mentioned voltage source UOS is connected to this terminal within the control apparatus. With the aid of this voltage source, both ground lines are raised at high resistance to the potential UOS with respect to the control apparatus ground.
  • the signals of both probes are supplied to a microprocessor ⁇ C.
  • the connecting circuit for each probe includes the above-mentioned control lines up to the control apparatus SG as well as function groups in the control apparatus forward of the microprocessor.
  • FIG. 1 is a block diagram corresponding to the detail circuit schematic of FIG. 3 for the rearward probe SH; whereas, FIG. 2 shows the block diagram for the forward probe SV. It is here noted that this arrangement is not absolutely necessary.
  • the circuit of FIG. 1 could be used for the forward probe and the circuit of FIG. 2 for the rearward probe.
  • the arrangement selected in the drawings is especially advantageous which will become apparent from the following.
  • the signal line SL -- SH and the ground line ML -- SH of a rearward probe SH are connected to a difference amplifier DV -- SH having an amplification factor G.
  • the signal line SL -- SH is connected via a pull-down resistor RPD to ground.
  • the potential of the ground line ML -- SH is raised with the aid of the above-mentioned offset voltage source UOS to the positive potential UOS with respect to ground.
  • the output voltage UA -- SH then is UOS+G ⁇ U -- SH.
  • U -- SH is then the voltage supplied by the rearward probe SH. This is apparent from the equivalent circuit diagram of the probe which includes an equivalent voltage source U -- SH and an equivalent probe internal resistor R -- SH.
  • a forward probe SV is connected via the signal line SL -- SV and the ground line ML -- SV to a differential amplifier DV -- SV.
  • the potential of the ground line is, in turn, raised by an offset voltage source UOS to the potential UOS with respect to ground.
  • the probe SV includes an equivalent circuit diagram having an equivalent voltage source U -- SV and an equivalent resistor R -- SV.
  • the probe voltage is taken at a resistance RA which is connected in series with a voltage source UM parallel to the probe.
  • the voltage UM generated by the voltage source UM is a mean voltage which is then supplied when the probe measures exhaust gas of a mixture having the lambda value one.
  • the probe output voltage UA -- SV is then given by:
  • the equivalent or internal resistor R -- SV of the probe is very high in which case, the probe output voltage is approximately at the value UOS+G ⁇ UM.
  • the circuit of FIG. 3 includes an analog-to-digital converter between the difference amplifier DV -- SH and the microcomputer ⁇ C and between the difference amplifier DV -- SV and the microcomputer ⁇ C as well as a constant voltage source KS.
  • FIG. 4 a test method is described which permits faults to be detected in the connecting circuit shown as part of FIG. 3. However, only the most important faults are discussed and especially those where the offset voltage UOS is helpful in the determination.
  • the fault announcement can be stored in a memory and/or the fault can be visibly and/or acoustically announced. The method then returns to the first step.
  • the pull-down resistor is only shown for the circuit of the rearward probe. Such a pull-down resistor can however easily be connected to the signal line SL -- SV of the forward probe SV. This affords the advantage that an interruption is determined immediately as it occurs since then the output voltage UA -- SV drops below the offset voltage UOS. Without this kind of pull-down resistor, the output voltage UOS+G ⁇ UM adjusts in the circuit of FIG. 2 with the interruption of the signal line SL -- SV or the ground line ML -- SV. Because of the expected time-dependent trace of the signal of the probe SV described initially, it is not possible that this signal is at the above-mentioned constant value over a time span longer than several tenths of a second.
  • the interruption fault can be determined likewise for the forward probe SV.
  • the above-mentioned value is however very plausible and, for this reason, the interruption fault for this probe can be determined only with the aid of the pull-down resistor RPD.
  • step s3 If the above-mentioned fault is determined in step s3, then the corresponding fault announcement takes place in step s4 and the method returns to step s1.
  • steps s1 and s3 are run through without a fault announcement, a check is made in a step s5 as to whether the output voltage UA -- SV or UA -- SH of one of the two probes corresponds to the offset voltage UOS for a time span longer than a pregiven time span ⁇ tSW.
  • the time span ⁇ tSW can be relatively short for checking the connecting circuit of the forward probe (in the order of magnitude of several seconds); whereas, the time span can be longer for the connecting circuit of the rearward probe, in the order of magnitude of several ten seconds. If the occurrence of the investigated condition is determined, then in step s6, a fault announcement takes place that a short circuit is present in the connecting circuit for the forward or rearward probe. Then step s1 is again reached.
  • step s7 a check is made in step s7 as to whether the output voltage UA -- SV of the forward probe corresponds essentially to the value G ⁇ UM+UOS for more than a pregiven time span ⁇ tSW2.
  • the time span need only be a few tenths of a second. If this condition is fulfilled, a fault announcement takes place in a step s8 that an interruption in the connecting circuit of the forward probe SV is present. Step s1 is then reached again.
  • step s9 a check is made (step s9) as to whether for a cold probe, the output voltage UA -- SV of this probe has the voltage UM of the ancillary voltage source.
  • the output voltage should actually be UOS+G ⁇ UM. If in contrast, this voltage is only G ⁇ UM, this is an indication that the connection between offset voltage source UOS and the ground line is interrupted. In the advantageous circuit of the rearward probe according to FIG. 1, this fault can only be determined with difficulty without the ancillary voltage source UM.
  • step s9 it is advantageous to connect the ground line ML -- SH for the rearward probe SH to the same terminal on the control apparatus SG to which the ground line ML -- SV of the forward probe SV is connected.
  • the interruption to the offset voltage source can then take place for both probes in common with the above-mentioned sequence of step s9. If the occurrence of the condition investigated in step s9 is determined, then the announcement follows in step s10 for the above-mentioned fault. Thereafter, step s1 follows again.
  • step s11 an inquiry is made if the method should be ended, for example, because the ignition has been switched off and the fault investigation cannot be carried out in an after-running phase. If it results that the method should be continued, then the inquiry begins anew starting with step s1.
  • All the dimensioning data relate to an engine having a two-level lambda control while using zircon-oxide probes of the Nernst type. It is for the person of experience in this area no difficulty to adapt the dimensioning to other probes and to adapt to particular dead and delay times for a specific overall configuration and to undertake a specific control since only adaptations within the same order of magnitude are required. What is essential is that the ground line is provided with a potential offset with respect to ground potential. Furthermore, it is advantageous that the signal line is provided with a pull-down resistor.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Pathology (AREA)
  • Molecular Biology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
US07/872,810 1991-04-24 1992-04-24 Connecting circuit for connecting a lambda probe to a control apparatus of an internal combustion engine and test method for said circuit Expired - Lifetime US5298865A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4113316A DE4113316C2 (de) 1991-04-24 1991-04-24 Anschlußschaltung für eine Lambdasonde und Prüfverfahren für eine solche Schaltung
DE4113316 1991-04-24

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US (1) US5298865A (enExample)
JP (1) JPH05107299A (enExample)
KR (1) KR100235364B1 (enExample)
DE (1) DE4113316C2 (enExample)
ES (1) ES2036959B1 (enExample)
GB (1) GB2255185B (enExample)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5390651A (en) * 1993-10-29 1995-02-21 Precision Engine Controls Corporation Air/fuel ratio controller for larger internal combustion engines
US5494757A (en) * 1993-01-22 1996-02-27 Tomoegawa Paper Co., Ltd. Adhesive tape for electronic parts and liquid adhesive
US5528932A (en) * 1994-07-04 1996-06-25 Bayerische Motoren Werke Ag Method for recognizing lambda probes connected in a side-inverted manner
WO2001090734A1 (de) * 2000-05-24 2001-11-29 Siemens Aktiengesellschaft Prüf- und kalibriervorrichtung für eine auswerteschaltung einer linearen sauerstoffsonde (lambdasonde)
US20040100271A1 (en) * 2002-10-07 2004-05-27 Denso Corporation Oxygen sensor abnormality detecting device having offset voltage circuit
US6757567B2 (en) * 2000-03-27 2004-06-29 Campagnolo Srl Multiprocessor control system for cycles, for example for competition bicycles
EP1460418A1 (en) * 2003-03-18 2004-09-22 NGK Spark Plug Company Limited Oxygen concentration detection system and vehicle control system having the same
US20050131601A1 (en) * 2003-12-11 2005-06-16 Mitsubishi Denki Kabushiki Kaisha Failure diagnostic apparatus and method for an air-fuel ratio sensor
US20060219555A1 (en) * 2005-03-31 2006-10-05 Ngk Spark Plug Co., Ltd. Gas sensor control unit
US20070012564A1 (en) * 2005-07-13 2007-01-18 Denso Corporation Element crack detecting apparatus and method for oxygen sensor
US20080185289A1 (en) * 2007-02-05 2008-08-07 Denso Corporation Sensor control device
US20080237591A1 (en) * 2002-08-08 2008-10-02 Elm Technology Corporation Vertical system integration
US20110012630A1 (en) * 2007-11-14 2011-01-20 Claudius Bevot Device for checking the operability of a sensor element
US20110257863A1 (en) * 2010-04-20 2011-10-20 Robert Bosch Gmbh Method for operating an internal combustion engine
US9594049B2 (en) 2013-08-09 2017-03-14 Denso Corporation Gas sensor control apparatus
US9850844B2 (en) * 2013-08-15 2017-12-26 Robert Bosch Gmbh Universal control and evaluation unit particularly for operation of a lambda probe
US9880127B2 (en) * 2012-07-25 2018-01-30 Robert Bosch Gmbh Fault simulator for checking the diagnosis implemented in a control device for a lambda sensor in an internal combustion engine

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DE4137626A1 (de) * 1991-11-15 1993-05-19 Bosch Gmbh Robert Anschlussschaltung fuer eine sauerstoffsonde und pruefverfahren fuer richtigen sondenanschluss
DE19721366A1 (de) * 1997-05-22 1998-11-26 Bosch Gmbh Robert Elektrische Schaltungsanordnung
JP4520652B2 (ja) * 2001-02-27 2010-08-11 日本特殊陶業株式会社 空燃比センサの異常検出方法
JP4157576B2 (ja) * 2006-09-25 2008-10-01 三菱電機株式会社 エンジン制御装置
JP4478181B2 (ja) * 2007-09-25 2010-06-09 三菱電機株式会社 エンジン制御装置
JP6442920B2 (ja) * 2014-08-21 2018-12-26 株式会社デンソー ガスセンサ制御装置及び空燃比検出システム
DE102019204219A1 (de) * 2019-03-27 2020-10-01 Robert Bosch Gmbh Verfahren zur Diagnose von Abgassensoren
DE102019204827A1 (de) * 2019-04-04 2020-10-08 Robert Bosch Gmbh Verfahren zur Diagnose von Abgassensoren

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US4526147A (en) * 1983-03-29 1985-07-02 Robert Bosch Gmbh Apparatus for controlling the air-fuel ratio of an internal combustion engine
US4622809A (en) * 1984-04-12 1986-11-18 Daimler-Benz Aktiengesellschaft Method and apparatus for monitoring and adjusting λ-probe-controlled catalytic exhaust gas emission control systems of internal combustion engines
US4951632A (en) * 1988-04-25 1990-08-28 Honda Giken Kogyo K.K. Exhaust gas component concentration sensing device and method of detecting failure thereof
US5091698A (en) * 1989-02-04 1992-02-25 Robert Bosch Gmbh Circuit for measuring the internal resistance of a lambda probe

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DE2304622A1 (de) * 1973-01-31 1974-08-15 Bosch Gmbh Robert Einrichtung zur ueberwachung von katalytischen reaktoren in abgasentgiftungsanlagen von brennkraftmaschinen
DE2649272C2 (de) * 1976-05-22 1986-04-03 Robert Bosch Gmbh, 7000 Stuttgart Regelverfahren und Gemischverhältnisregeleinrichtung zur Bestimmung der Verhältnisanteile eines einer Brennkraftmaschine zugeführten Kraftstoff-Luftgemisches
DE2919220A1 (de) * 1979-05-12 1980-11-27 Bosch Gmbh Robert Verfahren zur regelung des kraftstoff/luftverhaeltnisses bei brennkraftmaschinen
DE3024607A1 (de) * 1980-06-28 1982-02-04 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur regelung des kraftstoff/luftverhaeltnisses bei brennkraftmaschinen
DE3433305A1 (de) * 1984-09-11 1986-03-20 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Verfahren und vorrichtung zur regelung der zusammensetzung des kraftstoff-luft-gemisches einer brennkraftmaschine
DE3904986A1 (de) * 1989-02-18 1990-08-23 Bosch Gmbh Robert Verfahren zum erkennen der betriebsbereitschaft einer lambdasonde

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US4526147A (en) * 1983-03-29 1985-07-02 Robert Bosch Gmbh Apparatus for controlling the air-fuel ratio of an internal combustion engine
US4622809A (en) * 1984-04-12 1986-11-18 Daimler-Benz Aktiengesellschaft Method and apparatus for monitoring and adjusting λ-probe-controlled catalytic exhaust gas emission control systems of internal combustion engines
US4951632A (en) * 1988-04-25 1990-08-28 Honda Giken Kogyo K.K. Exhaust gas component concentration sensing device and method of detecting failure thereof
US5091698A (en) * 1989-02-04 1992-02-25 Robert Bosch Gmbh Circuit for measuring the internal resistance of a lambda probe

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5494757A (en) * 1993-01-22 1996-02-27 Tomoegawa Paper Co., Ltd. Adhesive tape for electronic parts and liquid adhesive
US5390651A (en) * 1993-10-29 1995-02-21 Precision Engine Controls Corporation Air/fuel ratio controller for larger internal combustion engines
US5528932A (en) * 1994-07-04 1996-06-25 Bayerische Motoren Werke Ag Method for recognizing lambda probes connected in a side-inverted manner
US6757567B2 (en) * 2000-03-27 2004-06-29 Campagnolo Srl Multiprocessor control system for cycles, for example for competition bicycles
US7623931B2 (en) 2000-03-29 2009-11-24 Campagnolo S.R.L. Multiprocessor control system for cycles, for example for competition bicycles
US7200447B2 (en) 2000-03-29 2007-04-03 Campagnolo, S.R.L. Multiprocessor control system for cycles, for example for competition bicycles
US20030080003A1 (en) * 2000-05-24 2003-05-01 Dariusch Akhavan Testing and calibrating device for an evaluation circuit for a linear oxygen probe (lambda probe)
WO2001090734A1 (de) * 2000-05-24 2001-11-29 Siemens Aktiengesellschaft Prüf- und kalibriervorrichtung für eine auswerteschaltung einer linearen sauerstoffsonde (lambdasonde)
US6960290B2 (en) 2000-05-24 2005-11-01 Siemens Aktiengesellschaft Testing and calibration device for an oxygen probe evaluation circuit and method of use of the device
US20080237591A1 (en) * 2002-08-08 2008-10-02 Elm Technology Corporation Vertical system integration
US20040100271A1 (en) * 2002-10-07 2004-05-27 Denso Corporation Oxygen sensor abnormality detecting device having offset voltage circuit
US6912887B2 (en) 2002-10-07 2005-07-05 Denso Corporation Oxygen sensor abnormality detecting device having offset voltage circuit
US7416649B2 (en) 2003-03-18 2008-08-26 Ngk Spark Plug Co., Ltd. Oxygen concentration detection system and vehicle control system having the same
US20040222094A1 (en) * 2003-03-18 2004-11-11 Ngk Spark Plug Co., Ltd. Oxygen concentration detection system and vehicle control system having the same
EP1898212A3 (en) * 2003-03-18 2011-11-30 NGK Spark Plug Co., Ltd. Oxygen concentration detection system and vehicle control system having the same
EP1460418A1 (en) * 2003-03-18 2004-09-22 NGK Spark Plug Company Limited Oxygen concentration detection system and vehicle control system having the same
US20050131601A1 (en) * 2003-12-11 2005-06-16 Mitsubishi Denki Kabushiki Kaisha Failure diagnostic apparatus and method for an air-fuel ratio sensor
US7536244B2 (en) * 2003-12-11 2009-05-19 Mitsubishi Denki Kabushiki Kaisha Failure diagnostic apparatus and method for an air-fuel ratio sensor
US20060219555A1 (en) * 2005-03-31 2006-10-05 Ngk Spark Plug Co., Ltd. Gas sensor control unit
US7481094B2 (en) 2005-03-31 2009-01-27 Ngk Spark Plug Co., Ltd. Gas sensor control unit
US20070012564A1 (en) * 2005-07-13 2007-01-18 Denso Corporation Element crack detecting apparatus and method for oxygen sensor
US7311093B2 (en) 2005-07-13 2007-12-25 Denso Corporation Element crack detecting apparatus and method for oxygen sensor
US8333875B2 (en) * 2007-02-05 2012-12-18 Denso Corporation Sensor control device
US20080185289A1 (en) * 2007-02-05 2008-08-07 Denso Corporation Sensor control device
US20110012630A1 (en) * 2007-11-14 2011-01-20 Claudius Bevot Device for checking the operability of a sensor element
US8330470B2 (en) 2007-11-14 2012-12-11 Robert Bosch Gmbh Device for checking the operability of a sensor element
US20110257863A1 (en) * 2010-04-20 2011-10-20 Robert Bosch Gmbh Method for operating an internal combustion engine
US8554444B2 (en) * 2010-04-20 2013-10-08 Robert Bosch Gmbh Method for operating an internal combustion engine
US9880127B2 (en) * 2012-07-25 2018-01-30 Robert Bosch Gmbh Fault simulator for checking the diagnosis implemented in a control device for a lambda sensor in an internal combustion engine
US9594049B2 (en) 2013-08-09 2017-03-14 Denso Corporation Gas sensor control apparatus
US9850844B2 (en) * 2013-08-15 2017-12-26 Robert Bosch Gmbh Universal control and evaluation unit particularly for operation of a lambda probe

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GB9207939D0 (en) 1992-05-27
KR920020219A (ko) 1992-11-20
DE4113316C2 (de) 2003-09-11
ES2036959A2 (es) 1993-06-01
GB2255185A (en) 1992-10-28
JPH05107299A (ja) 1993-04-27
DE4113316A1 (de) 1992-10-29
GB2255185B (en) 1995-01-18
ES2036959R (enExample) 1996-02-01
KR100235364B1 (ko) 1999-12-15
ES2036959B1 (es) 1996-10-01

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